Get a haynes manual for 25 dollars.there is pictures,timing marks and a list of tools you will need.by the time you buy all the tools,you could pay a mechanic to replace it.
unless you want to do it,and future repairs,it is not worth it to do it yourself.

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Are you replacing a broken timing belt? Or are you replacing a belt because it's due by miles? If the belt is broken, i strongly suggest inspecting for bent valves. Daewoo is notorious for bending all valves and breaking valve guides in the cylinder head when the timing belt breaks. The broken belt is also common.

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sorry i didnt see the TIMING belt in the title -
GMC recommends replacing Timing belt at 71,000 miles....
however your particular vehicle may have a timing CHAIN.

The 4.3L engine is the only engine covered by this guide which uses a timing chain and gear (sprocket) assembly to turn the camshaft. The 2.5L engine uses a direct gear drive (without a chain).

Only replace the chain if after inspecting it - it is worn or damaged! You don't adjust timing chain-you replace it or the tensioner Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

No they are not. The reason your manual does not saying anything about replacing the timing belt is because 9 times out of 10 most people do not know how to replace the timing belt and make sure that it is on properly and the timing is correct. Also the time belt should be changed around 115,000 miles. But it is never bad to go ahead and get it done if they already did it or are going to

1. Remove the Alternator Belt.2. Remove the Water Pump Pulley3. Remove the Air Conditioner Belt and Power Steering Belt.4. Remove the Crankshaft Pulley.5. Remove the timing belt cover6. Remove the timing belt tensioner pulley.7. Remove the Timing Belt.8. (If Replacing) Remove Idler Pulley.Installation is reverse of removal. Keep a close eye on the timing marks on the cam sprockets to make sure you don't knock anything out of whack.

I would strongly recommend replacing the water pump while you are replacing the timing belt. (The water pump usually comes in the timing belt kit.) Otherwise you are going to have to do this all over again when your water pump goes out. Good Luck.